This LODO 5.56×45 Upper Assembly comes ready to fire right out of the box upon installation onto any standard AR-15 lower receiver. Our LODO upper receiver group is assembled from premium components into a high performance-package.The upper assembly comes equipped with a 4150 chrome moly steel barrel.

20" 5.56x45 Hera KeyMod Spiral

  • Upper Receiver: A3 Flat-Top, Forged 7075-T6 Aluminum

    Barrel Length: 20″

    Barrel Contour: Socom Spiral Fluted Barrel

    Material: 4150 Chrome moly

    Muzzle Thread Pattern: 1/2 x 28

    Chrome Lined: No

    Barrel Finish: Phosphate

    Twist Rate: 1 in 9

     Chamber: 5.56×45

    M4 Feed Ramps: Yes

    Muzzle Device: A2

    Gas System Length: Rifle

    Gas Block Diameter: 0.750″

    Hand guard: Hera Arms, 15″ Key Mod, Free Float

    Bolt Carrier Assembly Included: No

    Charging Handle: No